How long will whipped cream last for? (A car journey....??)

[dairymoo]

I am planning on making Nigella's Ginger and Passionfruit trifle for a BBQ this evening and wondered if I can whip the cream before I go, transport in a large bowl, and then assemble on top of the ginger-wine soaked sponge when I get there? Don't fancy spending 15 mins whipping cream when I get there if I could be sipping a Pimm's!!

Does anyone know how long pre-whipped cream will stay 'peaky' for?

oh ages, esp if you use double cream

put it in a cold bag though as it will sag if it gets warm